U.S. Geological Survey, Procurement and Contracts Section, Building 25, Box 25046, MS 204A, Denver Federal Center, Denver, CO 80225

F -- DRILLING SERVICES SOL IFB 5-6072 DUE 072095 POC Maureen J. Corbett, Contract Specialist, (303) 236-5900 x337 Drilling of test holes and the installation of monitoring wells in south- central Rock County in southwestern Minnesota. The test holes shall be drilled from land surface to the top of the Sioux Quartzite hard rock surface. The monitoring wells will be installed in buried sand and gravel layers in the glacial drift and Split Rock Creek Formation. In the proposed drilling area, about 200 to 350 feet of glacial drift overlies about 250 to 400 feet of Split Rock Creek Formation deposits. The glacial drift deposits consist of glacial till and clay with interbedded sand and gravel layers. The Split rock Creek Formation is composed of layers of fine to coarse well-sorted quartzose sand interbedded with layers of siltstone, shale, and claystone. All responsible sources may submit an offer which will be considered. See Numbered Note 1 (0153)

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